Temperature alarm device



Oct. 1, 1935. I I c R WOOD 2,015,984

TEMPERATURE ALARM DEVICE Filed March 13, 1934 INVENTOR Cecil RWoofl ATTORNEY Patented Oct. 1, 1935 UNITED STATES PATENT OFFICE 1 Claim.

My invention relates to temperature alarm devices and my object is to provide a temperature controlled releasing mechanism for devices of this character.

Figure 1 represents a side elevation of the de vice, partly in section; Fig. 2, a cross sectional elevation through the center of the device, the electrical contacting means being removed; Fig. 3, a cross section end elevation of the device on the line 33 in Fig. 2, drawn to an enlarged scale; Fig. 4, a cross sectional elevation showing the balls wholly within the chamber l5; Fig. 5, a cross sectional elevation of the rod I I, through the chamber I5; and Fig. 6, a cross sectional elevation of the rod I I showing the fusible member I! disposed in chamber I5.

Although I show the preferred embodiment of.

my invention, I do not thereby limit myself to the precise details shown, but wish it understood that, within the scope of what hereinafter is claimed, various changes in the details may be made without departing from the spirit of the invention.

A cartridge holding member I, provided with a cartridge chamber 2, is disposed in one end of the housing 3 and held in position by a screw 4 which also holds the strap 5 provided with a hole 6. -A removable guide member I is disposed in the opposite end of housing 3 and held in position by a screw 8 which also holds a strap 9 provided with a hole I0. A rod II is slidably disposed in guide member I and provided with a pointed end I2 and a guide shoulder I3. An open helical spring I4 is disposed on rod II between guide shoulder I3 and guide member I. A chamber I5 extends diametrically through rod II and communicates with exit channels I6. A fusible spacer member I! is disposed in chamber I5 and balls I8 are disposed in chamber I5 so as to rest against fusible spacer member I! and to be held apart thereby, so as to protrude beyond the periphery of rod II to form stops which cooperate with guide member I to prevent rod II from sliding through guide member 'I and to hold spring I4 in a compressed position.

A tube 20 of insulation material is disposed on rod I I and secured thereto by a screw 2|. A terminal 22 is secured on tube 20 by a screw 23.

A terminal 24 is secured to housing 3 by a screw 25 and is adapted to cooperate with terminal 22 to close an electrical circuit formed ,by wires 26-21 and the source of electricity to which said wires are connected. The wires 2Ii2'l may be connected to a bell system or other electrically actuated devices.

In setting the device, the interior mechanism is removed. Guide member I is pressed against spring l4 beyond chamber I5; fusible spacer member I! and balls I8 are disposed in chamber I5 and guide member I is allowed to cooperate with balls I8 to hold spring I4 in the compressed position. When thus assembled the interior mechanism is replaced and held in position by 5 screw 8 and guide member I. A blank cartridge C is disposed in chamber 2 and member I returned to housing 3 and held in position by screw 4. The device is secured to a wall or other support by screws extending through holes 6-40 in 10 straps 5 and 9, respectively.

When the temperature in the vicinity of the device reaches a predetermined point, as for example 150 degrees F., the fusible spacer member I! melts and runs out through exit channels I6, thereby allowing balls I8 to be pressed into chamber I5 by guide member I, permitting spring I I to force rod II forward against the cap in cartridge C and thereby explode cartridge C. At the same time that the pointed end I2 of rod II strikes the cartridge cap, terminals 22 and 24 contact and close an'electrical circuit to operate an electrical alarm system, when such an alarm system is associated with my device.

The expanded gases resulting from the explosion of the cartridge C travel through pipe 28 to a general alarm system, when such alarm system is associated with my device.

It is my purpose to use my device in association with an electric alarm system, or with a general alarm system which I have invented to be operated by the expansion of the gases incident to the explosion of the cartridge, or with both alarm systems. When used without said 35 systems, I employ the cartridge C which is dis-. charged by the action of the device, the report of the explosion being sufilciently loud to give the alarm.

I claim:

In a temperature alarm device, the combination of a guide member adapted to be secured to a stationary object; a rod slidably disposed in said guide member and provided with a transverse chamber extending diametrically therethrough, and exit channels communicating with said chamber; a fusible spacer member disposed in said chamber; and a stop member disposed in 

